Machine for ramming foundry cores by means of compressed air



Sept. 30, 1952 F. HANSBERG 2,611,938

MACHINE FOR RAMMING FOUNDRY CORES BY MEANS OF COMPRESSED AIR Filed Oct.15, 1949 4 3 4 4 4 4 4 C .2; iA/mvro/a Patented Sept. 30, 1952 FORRAMMING FOUNDRY GORES BY MEANS OF COMPRESSED AIR Fritz Haasterg, Milan,Italy Application October 15, 1949, Serial No. 121,485 In- Italy J une15; 194-9 The present invention relatesto a machine f -or introducingand tamping casting sand into care moulds in order quickly to obtain theformation of cores to be introduced into the castings.

It is an object of the present invention to provide a machine allowingfor rapid preparationof cores of any size and shape, by means of merevalve adjustment. Other advantages of the invention Will appear from thefollowing description.

The machine according to; theinvention is essentially composed of ahollow body adapted to contain the casting sand and provided with one ormore discharge months for discharging in the direction of a support forcore moulds; compressed air is introduced into said hollow body by meansof a conduit, which is connected there: to through a valvehaving alargeaperture-andbeing quickly operable, which valvegmay-bepreceded byanother valve for adjustable throttling,- which latter valve has asmaller aperture than the first valve.

The accompanying drawing represents a vertical section of one embodimentof themachine according to the invention. I

In the embodiment diagrammatically represented in the drawing; theinachine -is'composed of a hollow standard or column I, whose innercavity acts as a compressed air receiver-or storage tank. To thestandard I there is connected by way of the bracket 2, the cylindricalbody 3 constituting the said storage tank; the walls of I the cavity ofthe body 3 a're-lined-with a p'erfo rated metal liner 4 which forms-anannular channel with the cylinder wall.

The lower head5 of the cylinder 3 comprises a conical part 6 termmatedby a central hole forming the seat for a replaceable nozzle 1'. Outsidethe cone 6, the head 5'com'prises a charn-ber 8 open inside by wayof aplurality of holes 9 covered by a metal wire gauze: ornetwork- Ill;

The bracket 2 carrying the cylinder 3 is rotatable about the standard land can be locked at the top against a head H containing a conduit [2,which is in communication with the cylinder 3 by way of a comparativelywide valve l3, and with the inside of the standard I by Way of a valvehaving smaller dimensions l4. Valve 13 is extended to form airusto-conical guide member 13 which together with the upper conicalsection 3' of the sand chamber provides an annular channel aligned so asto direct compressed air into the channel between cylinder 3 and liner4.

The valve [3 is controlled by means of a servomotor Whose piston 15 ispushed by the com- 2 pressed air entering. through the aperture l6comtrolled by a suitable valve not represented in the drawing.

The valve I4 is controlled t means' of the hand-'- whee screw n sothatits aperture can be ad justed at any time as needed.

Below the cylinder 3, abra'cket l8 iasteried to the standard 1 supportsa corej niculd carry ingplate' (9,, which sway of astem 20 integral orrigidly connected w til 2% piston if, :w ich too is displaceabl by meansof compressed air so as to 1m the core-mould carrying plate 9 againstthe cylinder a": v U r V th 22 are indicated paekm'gsfof elastic material' and with 23 is indicated a spring reacting against "the pistonl5. V r I operation or the machine is as follows: i

The cylinder 3 i's'filled with casting" sand'and then tightly lockedunder the head ll. On the ate l9 there" is fixed; or examp e by of apneumatic damp or a nown type, c re mould :5 in such arfiann'er' thatasuppetioiiei lih'g isplaced below the' nozzle" (arid is partly wcovered by the holes a, f; compressedfla 'is', introduced throughtli'eopriiiiglfif, tliepis'ton 5 rises against the 'reacticn' of the spring23" and very" rapidly" opens the valve; whence; can; pressedair enters:hefc'yli'rid'e'r 3 and no top as,,we11' a lateraliy' thr" gliner'qfpresssthe-sand c'o therefore; is 'forcedyiole'ntly out tnpletfely" until" the sand comes in fo'rced'lc the man fg'r'ating lcap-es through the mes: 9 a ber amen "d'i'scharges'toit eatiil'osphere''t' peripheral holes 9" or th r'ou'ghflar ger ele holesi 2'6"that' maybe" provided atariytantinefiti int. L i l 7 Durin this operation;tl'i'ecor'et d against the inner surface of the" headseftfie plate l9 bythe action of compressed air acting against the piston 2i when thiscompressed air is released, the plate [9 goes down again and thecore-mould with the formed core can be easily and quickly removed.

The operation of injecting sand into the coremould is extremely rapid,so as to deserve being end the valve l4 should be acted upon by'meansnevertheless equally rapid and perfect in every case.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is:

4 flow of compressed air into said sand chamber upon opening of saidvalve means.

3. A core blowing machine employing compressed air, comprising incombination a frame structure including a substantially tubularvertically disposed sand chamber, one end of said chamber forming anarrow nozzle for discharging sand into a core box and theother end awider air inlet opening for admitting compressed air into the sandchamber, a tubular lining member including transverse openingstherethrough dis- 1. A core blowing machine employing compressed air,comprising in combination a frame structure including a sand chamberhaving a wide air inlet opening and a narrow sand outlet opening, valvemeans disposed in said inlet opening for controlling the admission ofcompressed air into said chamber, valve control means for opening andclosing said valve means, and a lining member including a plurality oftransverse openings therethrough disposed within said sand chamberspaced apart from the chamber wall and open ended at the side facing thevalve means, said valve means including a valve body and a guide membermounted on the side of said valve body facing the said chamber andmovable in unison with the valve body, said guide member being shapedand positioned relative to the space between the chamber wall and thelining member so as to direct compressed air into the said space and toprovide space for the flow of compressed air into the sand chamber uponopening of said valve means.

2. A core blowing machine employing compressed air, comprising incombination a frame structure including a substantially tubularvertically disposed sand chamber, one end of said chamber forming anarrow nozzle for discharging sandinto a core box and the other end awider,

air'inlet opening for admitting compressed air.

into the sand chamber, a tubular lining member including a plurality oftransverse openings therethrough disposed within said sand chamberconcentrically therewith and spaced apart from the wall of the chamberso as to form an annular open channel between the lining member and thechamber wall, and valve means for controlling the'rate of flow ofcompressed air, valve control means for opening and closing said valvemeans, said valve means including a valve body seated on said inletopening and a guide member secured to'the valve bodyon the side thereoffacing the sand chamber, said guide member being shaped and positionedto direct compressed air into said annular. channel and to provide spacefor the posed within said sand chamber concentrically therewith andspaced apart from the wall of the chamber so as to form an annular openchannel between the lining member and the chamber wall,

said sandchamber having a substantially frustoconical section positionedabove said lining member, the narrow end of said section including saidinlet opening, and valve means for controlling the rate of flow ofcompressed air through said inlet opening, valve control means openingand closing said valve means, said valve means including a valve body'seated on said inlet opening and a guide member secured to the valvebody on the side'thereof facing the sand chamber and the lining-membertherein, said guide member having a substantial frusto-conical shape andbeing positioned within said' conical section so as to form 'asecondannular channel therewith, said latter channel being aligned so asto direct compressed air into the annular channel formed by the liningmember and the tubular section of the sand chamber upon opening of thevalve means, a space being interposed between the adiacent ends oftheguide member and the lining member so-asto" provide for a flow ofcompressed air leaving said second channel into said tubular sectionofthe sand chamber upon opening of the valve means.

FRITZ HANSBERG.

-REFERENCES cirnn The following references are of record in the file ofthis patent:

UNITEDSTATES PATENTS Number Name Date 1,022,363 Harrison Apr. 12, 19121,086,824 Hewlett Feb. 10, 1914 1,447,376 Campbell Mar. 6, 19231,950,632 Romph Mar. 13, 1934 2,259,768 Naylor 1 Oct. 21, 1941 2,300,148Gilliland Oct/27, 1942 2,490,559 Taccone 1 Dec. 6, 1949 FOREIGN PATENTSNumber Country Date 557,503 Germany Aug. 24, 1932 657,498, Germany Mar.5, 1933 154,245 Switzerland Apr. 30, 1932

